Apple posted a support document over the weekend on its Web site addressing reports of interminable “blue screen” problems that caused some Mac users upgrading to Mac OS X Leopard no small degree of frustration.

Some attempts to upgrade to Leopard were stymied after the installation process was almost complete and users attempted to restart their machines. A long thread on Apple’s discussion forums outlined the problems, in which their Macs would get hung up on the initial boot screen. That screen happens to be blue, inviting comparisons to the infamous Windows “blue screen of death” encountered when Windows crashes.

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